I have 17x9.5 +38 gram lights 57C that were on the rear of my S14. With a 265 wide tire there was maybe half a cm of clearance between the tire and the fender(not rolled) with some negative camber. With more neutral camber it would rub the fender I think, but not positive.
I am not sure about clearance on the inside though. It wasnt hitting anything but I don't know how close it was.
The front have 17X8.5 +40 with what I think is a 5mm spacer and there is no clearance problems.
http://home.comcast.net/~paxton_l/240sx ... 240sx8.jpg
Those are some pics of my car with the Gram lights if that helps.
I am actually trying to sell these to pay for SPL coilovers since my GAB's seals are exploded.